Pilot burner



Dec. 18, 1951 H, B, DONLEY 2,579,371

PILOT BURNER Filed 001'.. 11, 1947 MMNMMNMWWV-f "(Hmlllllllllll llllmbl` f L9* LL* e 090099 eaeesw -S069 e /O 0 O o "l ff s 5 c o o\ \o o o a l 7/ l c o \0 o o o '2lmi 2 725 @M fw.

Patented Dec. 18, 195,1

i Harold BI'Donley," Columbus, Ohio, assignor to Columbus Metal Products, Inc., Columbus, Ohio,

' a corporation of Ohio ppucanmo'ctobi 11, 1947, serial No. 779,357

1 claim. (ci. 15s- 91)l yThis invention relates to a pilot'light for'use in a.v fuel burner.` It has'forone object to vpro-- vide a pilot burner suitable for use in the so-called pot type burner.

Another object is to provide apilot burner which can be supplied with' fuel through the main source from which 'the burner as a whole' is'n'ormally supplied' during combustion.H QA still further object is tor provide a pilot burner arranged to discharge itsflame directly toward the zone ofA primary vaporization of thel main burner. 'f

Other objects will appear from time to time in the specification and claims.

The invention is illustrated more or less diagrammatically in the accompanying drawings, wherein: A

Figure l position in one form be applied;

Figure 2 is a horizontal sectional detailtaken at line 2-2 of Figure l and showing the pilot in plan;

Figure 3 is a vertical sectional detail taken at line 3-3 of Figure 1 and showing the pilot in front elevation.

Like parts are indicated by like characters in the specification and drawings. A

I is a burner wall or housing which is partially closed by a plate 2 provided with an opening 3. A ledge member 4 is fixed within the housing I and supports a burner pot 5 which may be provided with a lateral ange E. This flange rests upc-n the ledge 4. At its bottom the pot 5 is closed by a plate 1. In this form the plate is integral with the wall of the pot 5. A flame plate 8 may rest upon the upper open end of the pot 5. It is provided with a central opening 9 and with a spacing annular member I0.

The pot itself is provided with a plurality of rows or groups of holes II arranged above its bottom.v Toward its top it is provided with a row or group of upwardly inclined holes I2.

The pot is provided with a nipple I3 into which is threaded a fuel conduit or pipe I4.

The pilot includes a member I5 provided with an open bottom and shaped to fit upon the bottom 'l of the pot of the main burner. The member I5 is downwardly inclined in the direction of the center of the pot and is provided with an open end I1. Toward its upper or outer end the pilot is provided with a wall member IIB-which may have one or more rows or groups of perforations I9 or 20. Ordinarily only one such group of perforations will be present. but,

isfal vertical sectionof the pilot in of burner to which it "may A integral with the members if desired, both may beused. An upwardA and:

preferably integral extension 2'I lis formed on the member I5. The interior of the extension 2l is separated from the interior of the pilot wall member I8. Lateral extensions 22, preferably I5 and 2|, are perforated to receive bolts, screws or other fastening members 23'.

A nipple 24 is fixed tion in the wall 5 of in an appropriateperfora'- the pot. This nipple'has i threaded into it an air inlet or conduit 25 through which air enters from outside of the main Vburner structure. Y 1,

It will be vrealized that although I have illustrated and described an operative devicel still many changes may be made without departing materially from the spirit of my invention, and I wish, therefore, that my showing beA taken .as in a broad sense illustrative andv diagrammatic rather than limiting me to my precise' showing.

The use and operation of' this invention are as follows: 'f l In the particular form shown, the pilot is assembled in a burner pot which includes the wall 5 and the bottom 1. The burner pot forms a bottom for the pilot and also a partial rear Wall for the pilot. The space bounded by the wall I8 and the extension 2I is closed by the side wall of the pot 5. Although the pot shown is round, it might be of any shape, and the shape which would then be given to the pilot structure would be such that the pilot structure would t closely against the burner pot wall no matter what the shape of the latter might be.

Air for the main combustion in the main pot enters through the opening 3, passes upwardly about the space bounded by the members I and 5, and enters the pot through the holes II.

This may be considered the primary air. As the fuel within the main pot vaporzes it passes upwardly in the form of a rich mixture. Secondary airis added to this mixture through the holes l2, and combustion takes place toward or at the upper margin of the pot 5, flames generally extending through the opening 9. The heat of this combustion is eiective in carrying out the necessary vaporization for continued burning. All of the fuel burned in the main pot, as well as the fuel burned in the pilot, passes through the conduit I4 and through the interior of the pilot. The fuel which is not burned in the pilot moves generally as a liquid along the plate l and is discharged through the opening Il of the pilot into the pot 5. There it is vaporized or further vaporized and mixed with the air entering through the jacent the opening 3 openings Il and I2, and burned as above mentioned. When full burning of the main burner is not desired, the quantity of fuel entering through the conduit I4 is reduced to that point at which it will merely supply fuel for the necessary combustion of the pilot light. Air enters the pilot from the conduit 25, and after Ypassing through the extension Ztl, discharged into the interior of the pilot through the openings VI9 or Z. Whether one or two rows or groups of openings be provided, the result is the same. They furnish air for primary evaporation and Yform the initial mixture of fuel and air. This mixture isignited,

usually manually, and burns 'towa ing l1. At that point some secondary or additional air may be mixed With'tlie "fflame 6'1" imi-Sc'- discharge ture of fuel. The pilot thus provides means'V for Y maintaining a limited name within the main pot.

supportit. When lt'hfe quaritityfi f'el is theretefter reduced to a pl't below tiret necessary-to support combustion within the main pot *5, that combustion stops, 'and l u lnthe'pilotfcontiiiuesuntll the quantity of Afuel again increased.

Iclaim:

a, bottom 'well ene 4'sigle jwell, e 'generally lm*- perforete walled pilot 'structure adeptes jto te positioned within a "pt, 'said pilot structure irl- -cluding wall portions having side and bottom edges adapted to contact the side and bottom Walls of a pot and to dene, with the side and bottom walls of a pot, a mixing chamber adapted to receive a liquid fuel supplied to such a pot, said pilot structure including wall portions adapted to deflne. Wit h a pot side wall, a plenum chamberjsiipereposed bifer that portion of lthe mixing chamber closest to the p''t side wall, said Vplenum chamber having a radial extension inwardly to- 4ward the center of the pot, substantially less than th'at'f the mixing chamber, and being outwardly cpen'tothe pogt side wall when the pilot structure Nin lfusitioninafptt, whereby it is adapted to potuthe'pilot structure including a partition positibl'e'dA 'and 'ake'ted to separate the plenum chamberfrom the mixing chamber, said partition having therein a plurality of air inlet apertures adapted to direct air jets from the interior of the plenum Vchaiiflbei to tHe interior of the mixing xmgeiiembet hating e top wellA chamber, the extending 'downwardly 'and'inwar'dly from the plenum chamber, said top wall"lo"eing generally arcuate 4in vtransverse cross-sectifo'rl, and v'having side edge portions which, 'when 'the pilot structure is in position ina pot, are adopted 'to 'engage the bottoil of th'e pot; 'the said 'top 'wall defining at its inile'r edge a lip adapted'to de n'e, with the botto@ 'well of e pot, en upwardly arched flame opening.

l HAROID BQ IONIJEY.

REFERfls-,fTD v v The following references are of record in .the

le of this npatent:

'N'IED UA'ES 'PATENTS Nellie Date Livar Feb. `20, 1945 

